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Unit 4(C):Unit 4(C):VisionVision
Mr. McCormickMr. McCormick
A.P. PsychologyA.P. Psychology
Do-NowDo-Now(Discussion)(Discussion)
Raise your hand if you are either Raise your hand if you are either nearsightednearsighted or or farsightedfarsighted..
What What causes causes NearsightednessNearsightedness (Myopia) (Myopia) and and FarsightednessFarsightedness (Hyperopia)(Hyperopia)??
TransductionTransduction
Transduction:Transduction: Conversion of one form of energy into anotherConversion of one form of energy into another Transformation of stimulus energies, such as Transformation of stimulus energies, such as
sights, sounds, and smells into neural sights, sounds, and smells into neural impulses the brain can interpretimpulses the brain can interpret
The Stimulus Input: Light EnergyThe Stimulus Input: Light Energy
VisibleSpectrum
The Stimulus Input: Light EnergyThe Stimulus Input: Light Energy
Wavelength:Wavelength: The distance from the peak The distance from the peak
of one light or sound wave of one light or sound wave to the peak of the nextto the peak of the next
Hue:Hue: Dimension of color that is Dimension of color that is
perceivedperceived Determined by the Determined by the
wavelength of lightwavelength of light E.g. green, blueE.g. green, blue
Wavelength (Hue)Wavelength (Hue)
400 nm 700 nmLong wavelengthsShort wavelengths
Violet Indigo Blue Green Yellow Orange Red
Different wavelengths of light resultin different colors.
The Stimulus Input: Light EnergyThe Stimulus Input: Light Energy
Intensity:Intensity: The amount of energy in a light or sound waveThe amount of energy in a light or sound wave Determined by the wave’s amplitudeDetermined by the wave’s amplitude E.g. brightness (vision), loudness (hearing)E.g. brightness (vision), loudness (hearing)
Intensity (Brightness)Intensity (Brightness)
Blue color with varying levels of intensity.As intensity increases or decreases, blue color
looks more “washed out” or “darkened.”
AccommodationAccommodation
Accommodation:Accommodation: The process by which the eye’s lens changes shape to focus The process by which the eye’s lens changes shape to focus
near or far objects on the retinanear or far objects on the retina
The EyeThe Eye
The RetinaThe Retina
Receptors in the Human EyeReceptors in the Human Eye
Demonstration: Rods and ConesDemonstration: Rods and Cones
When looking at When looking at
something through your something through your peripheral visionperipheral vision, ,
why is it why is it difficultdifficult to to
determine its determine its ccoolloorr??
The Optic Nerve, The Optic Nerve, Blind Spot, and FoveaBlind Spot, and Fovea
Demonstration:Demonstration:Test Your Blind SpotTest Your Blind Spot
Directions:Directions: Looking at your sheet, close your left eye, and fixate your right Looking at your sheet, close your left eye, and fixate your right
eye on the black dot. Move the page towards your eye and away eye on the black dot. Move the page towards your eye and away from your eye. At some point the car on the right will disappear from your eye. At some point the car on the right will disappear due to a blind spot.due to a blind spot.
Visual Information ProcessingVisual Information Processing
Parallel ProcessingParallel Processing
From Sensation to RecognitionFrom Sensation to Recognition
Young-Helmholtz Trichromatic Theory Young-Helmholtz Trichromatic Theory and Color Blindnessand Color Blindness
Ishihara Test
Color Blindness is a genetic disorder, Color Blindness is a genetic disorder, in which people are blind to green or red colors. in which people are blind to green or red colors.
This supports the Trichromatic Theory.This supports the Trichromatic Theory.
Opponent-Process TheoryOpponent-Process Theory
Opponent-Process TheoryOpponent-Process Theory
ReviewReview
When looking at an object, what When looking at an object, what determinesdetermines the the colorcolor and and brightnessbrightness that we that we perceiveperceive??
Discuss the Discuss the pathpath in which in which lightlight travels between travels between entering the entering the eyeeye and reaching the and reaching the brainbrain..
What is What is parallel processingparallel processing??
DifferentiateDifferentiate between the between the Young-Helmholtz Young-Helmholtz Trichromatic TheoryTrichromatic Theory and the and the Opponent-Process Opponent-Process TheoryTheory of vision.of vision.
HomeworkHomework
Research Study Response #5: Research Study Response #5: “Take a “Take a Long Look” (Pgs. 36-42)Long Look” (Pgs. 36-42)
Unit 4 FRQUnit 4 FRQ
Unit 4 Quiz:Unit 4 Quiz: “Sensation and Perception”“Sensation and Perception” (W) 11/16/11(W) 11/16/11
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